KECK OBSERVATORY CALENDAR FOR 2021 -NAUTICAL (computed for altitude 4160.0 m) NAUTICAL(12 deg) TWILIGHT/DAWN MOON(midnight) DATE(HST) SUN TWILIGHT ENDS MOON MOON DAWN BEGINS SUN SIDEREAL TIMES NIGHT (12 deg) Zenith 2021 SET RISE SET RISE TWI MID DAWN LENGTH DARK___ RA DEC Dist 12 18 18 12 12 12 h h % h m d m deg WED SEP 01 18 48 19 26 19 53 01 52 15 11 04 52 05 18 05 56 17 50 22 25 03 44 9.9 6.4 65 0707 2514 >90 THU SEP 02 18 47 19 25 19 52 02 47 16 02 04 52 05 18 05 57 17 53 22 29 03 48 9.9 7.4 74 0801 2402 >90 FRI SEP 03 18 46 19 24 19 51 03 45 16 51 04 52 05 19 05 57 17 56 22 33 03 53 9.9 8.4 84 0855 2135 >90 SAT SEP 04 18 45 19 23 19 50 04 43 17 36 04 53 05 19 05 57 17 59 22 37 03 57 9.9 9.3 93 0948 1759 >90 SUN SEP 05 18 44 19 22 19 49 05 41 18 19 04 53 05 19 05 57 18 02 22 41 04 01 9.9 9.9 100 1039 1323 >90 MON SEP 06 18 43 19 21 19 48 06 39 18 59 04 53 05 19 05 57 18 05 22 45 04 05 10.0 10.0 100 1130 0801 >90 TUE SEP 07 18 43 19 21 19 47 19 38 04 54 05 20 05 58 18 09 22 49 04 10 10.0 9.7 97 1220 0208 >90 WED SEP 08 18 42 19 20 19 46 20 17 04 54 05 20 05 58 18 12 22 53 04 14 10.0 9.1 90 1310-0357 >90 THU SEP 09 18 41 19 19 19 45 20 57 04 54 05 20 05 58 18 15 22 57 04 18 10.0 8.4 83 1402-0956 >90 FRI SEP 10 18 40 19 18 19 44 21 40 04 54 05 20 05 58 18 18 23 01 04 22 10.0 7.7 76 1455-1528 >90 SAT SEP 11 18 39 19 17 19 43 22 27 04 55 05 21 05 59 18 21 23 05 04 26 10.1 6.9 68 1551-2012 >90 SUN SEP 12 18 38 19 16 19 42 23 18 04 55 05 21 05 59 18 24 23 09 04 30 10.1 6.1 60 1651-2346 >90 MON SEP 13 18 37 19 15 19 41 00 14 04 55 05 21 05 59 18 27 23 12 04 34 10.1 5.1 50 1754-2539 90 TUE SEP 14 18 36 19 14 19 40 01 14 04 56 05 21 05 59 18 30 23 16 04 38 10.1 4.1 40 1855-2621 79 WED SEP 15 18 35 19 13 19 39 14 45 02 16 04 56 05 22 05 59 18 33 23 20 04 43 10.1 3.1 30 1956-2515 67 THU SEP 16 18 34 19 12 19 38 15 39 03 18 04 56 05 22 06 00 18 36 23 24 04 47 10.2 2.1 20 2055-2236 56 FRI SEP 17 18 33 19 11 19 37 16 28 04 17 04 56 05 22 06 00 18 38 23 28 04 51 10.2 1.1 10 2151-1842 45 SAT SEP 18 18 32 19 10 19 36 17 11 05 14 04 57 05 22 06 00 18 41 23 32 04 55 10.2 0.1 1 2244-1356 36 SUN SEP 19 18 32 19 09 19 35 17 50 06 08 04 57 05 23 06 00 18 44 23 36 05 00 10.2 0.0 0 2334-0835 28 MON SEP 20 18 31 19 08 19 34 18 26 04 57 05 23 06 00 18 47 23 40 05 04 10.2 0.0 0 0021-0258 25 TUE SEP 21 18 30 19 07 19 33 19 01 04 57 05 23 06 01 18 50 23 44 05 08 10.3 0.0 0 0107 0239 27 WED SEP 22 18 29 19 06 19 32 19 35 04 58 05 23 06 01 18 53 23 48 05 12 10.3 0.5 4 0153 0803 32 THU SEP 23 18 28 19 05 19 31 20 09 04 58 05 23 06 01 18 56 23 52 05 16 10.3 1.1 10 0238 1302 40 FRI SEP 24 18 27 19 05 19 30 20 45 04 58 05 24 06 01 19 00 23 56 05 21 10.3 1.7 16 0325 1724 50 SAT SEP 25 18 26 19 04 19 29 21 23 04 58 05 24 06 01 19 03 00 00 05 25 10.3 2.3 22 0414 2100 59 SUN SEP 26 18 25 19 03 19 28 22 05 04 59 05 24 06 02 19 06 00 04 05 29 10.4 3.0 29 0504 2341 69 MON SEP 27 18 24 19 02 19 27 22 51 04 59 05 24 06 02 19 09 00 08 05 33 10.4 3.8 36 0556 2517 79 TUE SEP 28 18 23 19 01 19 26 23 41 04 59 05 25 06 02 19 12 00 12 05 38 10.4 4.7 44 0647 2534 89 WED SEP 29 18 23 19 00 19 26 00 34 04 59 05 25 06 02 19 15 00 16 05 41 10.4 5.6 53 0743 2458 >90 THU SEP 30 18 22 18 59 19 25 01 30 14 42 05 00 05 25 06 03 19 18 00 20 05 45 10.4 6.5 62 0836 2256 >90 ONE LINE REFERS TO EVENING DATE NEW MOON Sep 07 00:50 UT AND FOLLOWING MORNING. FIRST QUARTER Sep 13 20:39 UT All dates and times are zone HST FULL MOON Sep 20 23:54 UT in upper table (except sid time). LAST QUARTER Sep 29 01:58 UT